WO2013191448A1 - Procédé et appareil permettant une distribution d'accès initial sur un lan sans fil - Google Patents

Procédé et appareil permettant une distribution d'accès initial sur un lan sans fil Download PDF

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Publication number
WO2013191448A1
WO2013191448A1 PCT/KR2013/005374 KR2013005374W WO2013191448A1 WO 2013191448 A1 WO2013191448 A1 WO 2013191448A1 KR 2013005374 W KR2013005374 W KR 2013005374W WO 2013191448 A1 WO2013191448 A1 WO 2013191448A1
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Prior art keywords
sta
backoff
fils
access
parameter
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PCT/KR2013/005374
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English (en)
Korean (ko)
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박기원
류기선
곽진삼
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엘지전자 주식회사
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Priority to US14/406,444 priority Critical patent/US9521694B2/en
Priority to KR1020147033336A priority patent/KR101585823B1/ko
Publication of WO2013191448A1 publication Critical patent/WO2013191448A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0875—Non-scheduled access, e.g. ALOHA using a dedicated channel for access with assigned priorities based access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a wireless LAN, and more particularly, to a method and apparatus for performing access to a medium in a wireless LAN.
  • IEEE 802.11ac is a wireless LAN technology using a 60GHz band.
  • IEEE 802.11af which utilizes a TV white space (TVWS) band.
  • IEEE 802.11ah utilizing the 900MHz band. They aim primarily at the expansion of extended grid Wi-Fi services, as well as smart grid and wide area sensor networks.
  • the existing WLAN medium access control (MAC) technology has a problem that the initial link setup time is very long in some cases.
  • the IEEE 802.11ai standardization activity has been actively performed recently.
  • IEEE 802.11ai is a MAC technology that addresses the rapid authentication process to drastically reduce the initial set-up and association time of WLAN. Standardization activities began in January 2011 as a formal task group. It became. In order to enable the fast access procedure, IEEE 802.11ai is based on AP discovery, network discovery, time synchronization function synchronization, Authentication & Association, and higher layer. Discussion of process simplification is underway in areas such as merging procedures with the Among them, procedure merging using piggyback of dynamic host configuration protocol (DHCP), optimization of full EAP (extensible authentication protocol) using concurrent IP, and efficient selective access (AP) point) Ideas such as scanning are actively discussed.
  • DHCP dynamic host configuration protocol
  • EAP efficient selective access
  • Another object of the present invention is to provide an apparatus for performing an initial access method.
  • an initial access method of a station (STA) in accordance with an aspect of the present invention includes a fast initial link setup (FILS) backoff parameter from an access point (AP).
  • the STA may perform a backoff procedure using the FILS backoff parameter and the last FILS backoff parameter determined based on an access category of data to be transmitted by the STA, wherein the FILS backoff
  • the parameter may include information for determining a size of a contention window (CW) and information for determining an arbitration inter-frame space number (AIFSN) for each of the access categories, wherein the access category is determined by the AP. It may be information for indicating the type of traffic data of the STA that allows access.
  • CW contention window
  • AIFSN arbitration inter-frame space number
  • CW contention window
  • AIFSN arbitration inter-frame space number
  • a large number of STAs may distribute STAs performing initial access to the AP.
  • WLAN wireless local area network
  • FIG. 2 is a diagram illustrating a layer architecture of a WLAN system supported by IEEE 802.11.
  • FIG. 3 is a conceptual diagram illustrating a scanning method in a WLAN.
  • FIG. 4 is a conceptual diagram illustrating an authentication and combining process after scanning of an AP and an STA.
  • 5 is a conceptual diagram for an active scanning procedure.
  • FIG. 6 is a conceptual diagram illustrating a method for transmitting a probe request frame.
  • FIG. 7 is a conceptual diagram illustrating a DCF access procedure.
  • FIG. 8 is a conceptual diagram illustrating a backoff procedure of a plurality of STAs.
  • 9 is a conceptual diagram illustrating an interval between frames.
  • FIG. 10 is a conceptual diagram illustrating a method of obtaining a TXOP of an STA.
  • 11 is a conceptual diagram illustrating an EDCA channel reference model.
  • FIG. 12 is a conceptual diagram illustrating a backoff procedure of the EDCA.
  • 13 is a conceptual diagram illustrating Polled TXOP timing.
  • FIG. 14 is a conceptual diagram illustrating a method by which an AP transmits a FILS backoff parameter according to an embodiment of the present invention.
  • 15 is a conceptual diagram illustrating a backoff procedure according to an embodiment of the present invention.
  • 16 is a conceptual diagram illustrating a method of transmitting a passivating scanning FILS backoff parameter according to an embodiment of the present invention.
  • 17 is a conceptual diagram illustrating a backoff procedure of an STA that performs passess scanning according to an embodiment of the present invention.
  • FIG. 18 is a conceptual diagram illustrating a backoff procedure based on a FILS backoff parameter according to an embodiment of the present invention.
  • FIG. 19 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • WLAN wireless local area network
  • FIG. 1A shows the structure of an infrastructure network of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
  • IEEE Institute of Electrical and Electronic Engineers
  • the WLAN system may include one or more basic service sets (BSSs) 100 and 105.
  • the BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
  • the BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.
  • the infrastructure BSS may include at least one STA, APs 125 and 130 that provide a distribution service, and a distribution system DS that connects a plurality of APs.
  • the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
  • ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
  • APs included in one ESS 140 may have the same service set identification (SSID).
  • the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
  • a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1, and 105-2 may be implemented. have. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
  • a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
  • 1B is a conceptual diagram illustrating an independent BSS.
  • an independent BSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-1, and 155-2 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-1, and 155-2 may be mobile STAs, and access to a distributed system is not allowed, thus allowing a self-contained network. network).
  • a STA is any functional medium that includes a medium access control (MAC) and physical layer interface to a wireless medium that conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. May be used to mean both an AP and a non-AP STA (Non-AP Station).
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers
  • the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • UE mobile subscriber unit
  • It may also be called various names such as a mobile subscriber unit or simply a user.
  • FIG. 2 is a diagram illustrating a layer architecture of a WLAN system supported by IEEE 802.11.
  • FIG. 2 conceptually illustrates a PHY architecture of a WLAN system.
  • the hierarchical architecture of the WLAN system may include a medium access control (MAC) sublayer 220, a physical layer convergence procedure (PLCP) sublayer 210, and a physical medium dependent (PMD) sublayer 200.
  • MAC medium access control
  • PLCP physical layer convergence procedure
  • PMD physical medium dependent
  • the PLCP sublayer 210 is implemented such that the MAC sublayer 220 can operate with a minimum dependency on the PMD sublayer 200.
  • the PMD sublayer 200 may serve as a transmission interface for transmitting and receiving data between a plurality of STAs.
  • the MAC sublayer 220, the PLCP sublayer 210, and the PMD sublayer 200 may conceptually include a management entity.
  • the management unit of the MAC sublayer 220 is referred to as a MAC Layer Management Entity (MLME) 225, and the management unit of the physical layer is referred to as a PHY Layer Management Entity (PLME).
  • MLME MAC Layer Management Entity
  • PLME PHY Layer Management Entity
  • Such management units may provide an interface on which layer management operations are performed.
  • the PLME 215 may be connected to the MLME 225 to perform management operations of the PLCP sublayer 210 and the PMD sublayer 200, and the MLME 225 may also be connected to the PLME 215 and connected to the MAC.
  • a management operation of the sublayer 220 may be performed.
  • SME 250 may operate as a component independent of the layer.
  • the MLME, PLME, and SME may transmit and receive information between mutual components based on primitives.
  • the PLCP sublayer 110 may convert the MAC Protocol Data Unit (MPDU) received from the MAC sublayer 220 according to the indication of the MAC layer between the MAC sublayer 220 and the PMD sublayer 200. Or a frame coming from the PMD sublayer 200 to the MAC sublayer 220.
  • the PMD sublayer 200 may be a PLCP lower layer to perform data transmission and reception between a plurality of STAs over a wireless medium.
  • the MAC protocol data unit (MPDU) delivered by the MAC sublayer 220 is called a physical service data unit (PSDU) in the PLCP sublayer 210.
  • the MPDU is similar to the PSDU. However, when an A-MPDU (aggregated MPDU) that aggregates a plurality of MPDUs is delivered, the individual MPDUs and the PSDUs may be different from each other.
  • the PLCP sublayer 210 adds an additional field including information required by the physical layer transceiver in the process of receiving the PSDU from the MAC sublayer 220 to the PMD sublayer 200.
  • the added field may be a PLCP preamble, a PLCP header, and tail bits required to return the convolutional encoder to a zero state in the PSDU.
  • the PLCP preamble may serve to prepare the receiver for synchronization and antenna diversity before the PSDU is transmitted.
  • the data field may include a coded sequence encoded with a padding bits, a service field including a bit sequence for initializing a scraper, and a bit sequence appended with tail bits in the PSDU.
  • the encoding scheme may be selected from either binary convolutional coding (BCC) encoding or low density parity check (LDPC) encoding according to the encoding scheme supported by the STA receiving the PPDU.
  • BCC binary convolutional coding
  • LDPC low density parity check
  • the PLCP header may include a field including information on a PLC Protocol Data Unit (PPDU) to be transmitted.
  • the PLCP sublayer 210 adds the above-described fields to the PSDU, generates a PPDU (PLCP Protocol Data Unit), and transmits it to the receiving station via the PMD sublayer 200, and the receiving station receives the PPDU to receive the PLCP preamble and PLCP. Obtain and restore information necessary for data restoration from the header.
  • PPDU PLCP Protocol Data Unit
  • FIG. 3 is a conceptual diagram illustrating a scanning method in a WLAN.
  • a scanning method may be classified into passive scanning 300 and active scanning 350.
  • the passive scanning 300 may be performed by the beacon frame 330 broadcast by the AP 300 periodically.
  • the AP 300 of the WLAN broadcasts the beacon frame 330 to the non-AP STA 340 every specific period (for example, 100 msec).
  • the beacon frame 330 may include information about the current network.
  • the non-AP STA 340 receives the beacon frame 330 that is periodically broadcast to receive the network information to perform scanning for the AP 310 and the channel to perform the authentication / association (authentication / association) process Can be.
  • the passive scanning method 300 only needs to receive the beacon frame 330 transmitted from the AP 310 without the need for the non-AP STA 340 to transmit the frame.
  • passive scanning 300 has the advantage that the overall overhead incurred by data transmission / reception in the network is small.
  • scanning can be performed manually in proportion to the period of the beacon frame 330, the time taken to perform scanning increases.
  • beacon frame For a detailed description of the beacon frame, see IEEE Draft P802.11-REVmb TM / D12, November 2011 'IEEE Standard for Information Technology Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications (hereinafter referred to as IEEE 802.11) 'are described in 8.3.3.2 beacon frame.
  • IEEE 802.11 ai may additionally use other formats of beacon frames, and these beacon frames may be referred to as fast initial link setup (FILS) beacon frames.
  • a measurement pilot frame may be used in a scanning procedure as a frame including only some information of a beacon frame. Measurement pilot frames are disclosed in the IEEE 802.11 8.5.8.3 measurement pilot format.
  • the active scanning 350 refers to a method in which a non-AP STA 390 transmits a probe request frame 370 to the AP 360 to proactively perform scanning.
  • the AP 360 After receiving the probe request frame 370 from the non-AP STA 390, the AP 360 waits for a random time to prevent frame collision, and then includes network information in the probe response frame 380. may transmit to the non-AP STA 390. The non-AP STA 390 may obtain network information based on the received probe response frame 380 and stop the scanning process.
  • the probe request frame 370 is disclosed in IEEE 802.11 8.3.3.9 and the probe response frame 380 is disclosed in IEEE 802.11 8.3.3.10.
  • the AP and the STA may perform an authentication and association process.
  • FIG. 4 is a conceptual diagram illustrating an authentication and combining process after scanning of an AP and an STA.
  • the authentication and association process may be performed through, for example, two-way handshaking.
  • 4A is a conceptual diagram illustrating an authentication and combining process after passive scanning
  • FIG. 4B is a conceptual diagram illustrating an authentication and combining process after active scanning.
  • the authentication and association process is based on an authentication request frame (410) / authentication response frame (420) and an association request frame (330), regardless of whether an active scanning method or passive scanning is used. The same may be performed by exchanging an association response frame 440 between the APs 400 and 450 and the non-AP STAs 405 and 455.
  • the authentication process may be performed by transmitting the authentication request frame 410 to the APs 400 and 450 in the non-AP STAs 405 and 455.
  • the authentication response frame 420 may be transmitted from the AP 400, 450 to the non-AP STAs 405, 455.
  • Authentication frame format is disclosed in IEEE 802.11 8.3.3.11.
  • the association process may be performed by transmitting an association request frame 430 to the APs 400 and 405 in the non-AP STAs 405 and 455.
  • the association response frame 440 may be transmitted from the AP 405 and 455 to the non-AP STAs 400 and 450.
  • the transmitted association request frame 430 includes information on the capabilities of the non-AP STAs 405 and 455. Based on the performance information of the non-AP STAs 405 and 455, the APs 400 and 350 may determine whether support is possible for the non-AP STAs 405 and 355.
  • the AP 300 or 450 may include the non-AP STA 405 in the association response frame 440 by including whether the association request frame 440 is accepted and the reason thereof, and capability information that can be supported. , 455).
  • Association frame format is disclosed in IEEE 802.11 8.3.3.5/8.3.3.6.
  • the association may be performed again or the association may be performed to another AP based on the reason why the association is not performed.
  • 5 is a conceptual diagram for an active scanning procedure.
  • the active scanning procedure may be performed by the following steps.
  • the STA 500 determines whether it is ready to perform a scanning procedure.
  • the STA 500 may perform active scanning by waiting until the probe delay time expires or when specific signaling information (eg, PHY-RXSTART.indication primitive) is received. have.
  • specific signaling information eg, PHY-RXSTART.indication primitive
  • the probe delay time is a delay that occurs before the STA 500 transmits the probe request frame 510 when performing the active scanning.
  • PHY-RXSTART.indication primitive is a signal transmitted from a physical (PHY) layer to a local medium access control (MAC) layer.
  • the PHY-RXSTART.indication primitive may signal to the MAC layer that it has received a PLC protocol data unit (PPDU) including a valid PLCP header in a physical layer convergence protocol (PLCP).
  • PPDU PLC protocol data unit
  • PLCP physical layer convergence protocol
  • DCF distributed coordination function
  • CSMA / CA carrier sense multiple access / collision avoidance
  • the probe request frame 510 includes information for specifying the APs 560 and 570 included in the MLME-SCAN.request primitive (eg, service set identification (SSID) and basic service set identification (BSSID) information). ) Can be sent.
  • SSID service set identification
  • BSSID basic service set identification
  • the BSSID is an indicator for specifying the AP and may have a value corresponding to the MAC address of the AP.
  • Service set identification (SSID) is a network name for specifying an AP that can be read by a person who operates an STA. The BSSID and / or SSID may be used to specify the AP.
  • the STA 500 may specify an AP based on information for specifying the APs 560 and 570 included by the MLME-SCAN.request primitive.
  • the specified APs 560 and 570 may transmit probe response frames 550 and 550 to the STA 500.
  • the STA 500 may unicast, multicast, or broadcast the probe request frame 510 by transmitting the SSID and the BSSID information in the probe request frame 510. A method of unicasting, multicasting or broadcasting the probe request frame 510 using the SSID and the BSSID information will be further described with reference to FIG. 5.
  • the STA 500 may include the SSID list in the probe request frame 510 and transmit the SSID list.
  • the AP 560, 570 receives the probe request frame 510 and determines the SSID included in the SSID list included in the received probe request frame 510 and transmits the probe response frames 550, 550 to the STA 200. You can decide whether to send.
  • the probe timer may be used to check the minimum channel time (MinChanneltime, 520) and the maximum channel time (MaxChanneltime, 530).
  • the minimum channel time 520 and the maximum channel time 530 may be used to control the active scanning operation of the STA 500.
  • the minimum channel time 520 may be used to perform an operation for changing the channel on which the STA 500 performs active scanning. For example, when the STA 500 does not receive the probe response frames 550 and 550 until the minimum channel time 520, the STA 500 may shift the scanning channel to perform scanning on another channel. When the STA 500 receives the probe response frame 550 until the minimum channel time 520, the STA 500 may process the received probe response frames 550 and 550 by waiting for the maximum channel time 530.
  • the STA 500 detects the PHY-CCA.indication primitive until the probe timer reaches the minimum channel time 520 so that other frames (eg, the probe response frames 550 and 550) are detected until the minimum channel time 520. Whether it is received by the STA 500 may be determined.
  • PHY-CCA.indication primitive may transmit information about the state of the medium from the physical layer to the MAC layer. PHY-CCA.indication primitive can inform the status of the current channel by using channel status parameters such as busy if channel is not available and idle if channel is available. If the PHY-CCA.indication is detected as busy, the STA 500 determines that probe response frames 550 and 550 received by the STA 500 exist and the PHY-CCA.indication is idle. If it is detected that the probe response frame (550, 550) received by the STA 500 may be determined that no.
  • the STA 500 may set the net allocation vector (NAV) to 0 and scan the next channel.
  • the STA 500 may perform processing on received probe response frames 550 and 550 after the probe timer reaches the maximum channel time 530. have. After processing the received probe response frames 550 and 550, the net allocation vector (NAV) is set to 0 and the STA 500 may scan the next channel.
  • determining whether the probe response frames 550 and 550 received by the STA 500 exist may include determining the channel state using the PHY-CCA.indication primitive. have.
  • the MLME may signal MLME-SCAN.confirm primitive.
  • the MLME-SCAN.confirm primitive may include a BSSDescriptionSet including all information obtained in the scanning process.
  • the STA 500 uses the active scanning method, it is necessary to perform monitoring to determine whether the parameter of the PHY-CCA.indication is busy until the probe timer reaches the minimum channel time.
  • MLME-SCAN.request primitive is a primitive generated by SME.
  • the MLME-SCAN.request primitive may be used to determine whether there is another BSS to which the STA is bound.
  • the MLME-SCAN.request primitive may specifically include information such as BSSType, BSSID, SSID, ScanType, ProbeDelay, ChannelList, MinChannelTime, MaxChannelTime, RequestInformation, SSID List, ChannelUsage, AccessNetworkType, HESSID, MeshID, VendorSpecificInfo.
  • BSSType BSSID
  • ScanType ProbeDelay
  • ChannelList MinChannelTime
  • MaxChannelTime MaxChannelTime
  • RequestInformation SSID List
  • ChannelUsage AccessNetworkType
  • HESSID HESSID
  • MeshID MeshID
  • VendorSpecificInfo VendorSpecificInfo
  • Table 1 below briefly illustrates information included in the MLME-SCAN.request primitive.
  • a request parameter included in MLME-SCAN.request.primitive may be used to determine whether the responding STA transmits a probe response frame.
  • the request parameter may include information for requesting that information of another BSS is included in the probe response frame.
  • the request parameter may include a report request field, a delay reference field, and a maximum delay limit field.
  • the report request field is information for requesting information of another BSS to be included in the probe response frame.
  • the delay reference field includes information about a delay type applied in response to the probe request frame, and the maximum delay limit field is a delay reference field. It may include maximum connection delay information for the delay type, indicated by.
  • the request parameter may include a minimum data rate field and / or a received signal strength limit field.
  • the minimum data rate field contains information on the lowest overall data rate in transmitting an MSDU or A-MSDU.
  • the received signal strength limit field may further include information about a limit value of a signal required for the receiver of the probe request frame to respond.
  • FIG. 6 is a conceptual diagram illustrating a method for transmitting a probe request frame.
  • FIG. 6 illustrates a method in which an STA broadcasts, multicasts, and unicasts a probe request frame.
  • FIG. 6A illustrates a method in which the STA 600 broadcasts a probe request frame 610.
  • the STA 600 may broadcast the probe request frame 610 by including a wildcard SSID and a wildcard BSSID in the probe request frame 610.
  • the wild card SSID and wild card BSSID may be used as an identifier for indicating all of the APs 606-1, 606-2, 606-3, 606-4, and 606-6 included in the transmission range of the STA 600. .
  • the probe response frame in response to the probe request frame 610 received by the APs 606-1, 606-2, 606-3, 606-4, and 606-6 receiving the broadcast probe request frame 610. If the STA is transmitted to the STA 600 within a predetermined time, the STA 600 may have a problem of receiving and processing too many probe response frames at a time.
  • FIG. 6B illustrates a method in which the STA 620 unicasts the probe request frame 630.
  • the STA 620 when the STA 620 unicasts the probe request frame 630, the STA 620 includes a probe request frame 630 including specific SSID / BSSID information of the AP. Can be transmitted. Among the APs receiving the probe request frame 630, only the AP 626 corresponding to the specific SSID / BSSID of the AP 620 may transmit a probe response frame to the STA 620.
  • FIG. 6C illustrates a method in which the STA 640 multicasts the probe request frame 660.
  • the STA 640 may include the SSID list and the wild card BSSID in the probe request frame 660.
  • APs 660-1 and 660-2 corresponding to the SSID included in the SSID list included in the probe request frame among the APs receiving the probe request frame 660 may transmit a probe response frame to the STA 640.
  • the MAC layer may use a distributed coordination function (DCF) as a method for sharing a wireless medium by a plurality of STAs.
  • DCF is based on carrier sensing multiple access with collision avoidance (CSMA / CA).
  • CSMA / CA carrier sensing multiple access with collision avoidance
  • the MAC layer defines a method for sharing media between STAs based on request to send (RTS) / clear to send (CTS).
  • RTS request to send
  • CTS clear to send
  • FIG. 7 is a conceptual diagram illustrating a DCF access procedure.
  • the STA may transmit a MAC protocol data unit (MPDU) that is about to be transmitted. If it is determined that the medium is in use by a carrier sensing mechanism, the STA may determine the size of a content window (CW) by a random backoff algorithm and perform a backoff procedure. The STA sets the CW to perform the backoff procedure and selects a random timeslot within the CW. This is called back off time. Among these, the STA with the shortest backoff time may access the medium, and the remaining STAs may stop the remaining backoff time and wait until the transmitting terminal is completed. After the frame transmission of the STA is completed, the remaining STAs may compete with the remaining backoff time to acquire a medium.
  • MPDU MAC protocol data unit
  • the STA may detect the channel state for a predetermined time.
  • the STA attempts to transmit after a random backoff time.
  • the DCF-based transmission method may prevent collisions by playing a role of preventing a plurality of STAs from colliding due to simultaneous transmission.
  • the random backoff time is a time that the channel waits for a predetermined time (for example, DIFS) before transmitting a frame, and the random backoff time may be defined as in the following equation.
  • FIG. 8 is a conceptual diagram illustrating a backoff procedure of a plurality of STAs.
  • a backoff slot may occur after the medium is determined to be idle for the DIFS period. If the activity of the medium is not detected, the STA may reduce the backoff time based on aSlotTime. If it is determined that the medium is in use during the backoff slot, the STA may not reduce the backoff time. The frame transmission of the STA may be started whenever the set backoff timer becomes zero.
  • the DCF transmission scheme includes an RTS / CTS access mode in which control frames (RTS and CTS) are exchanged and occupy channels in advance before data frames are transmitted.
  • This method can reduce the waste of the channel by replacing the collision that may occur when the STA transmits the data frame to a collision by a relatively short control frame.
  • a point coordination function may be defined as another method for sharing a wireless medium by a plurality of STAs in the MAC layer.
  • PCF may be used as a method for providing a quality of service (QoS) for real time data transmission.
  • QoS quality of service
  • PCF also called non-competitive transmission service, does not exclusively use the entire transmission period of a medium, but may alternately use a contention-based service of DCF scheme.
  • a point coordinator implemented in an AP of a BSS may control a right for each STA to occupy a medium using a polling scheme.
  • PIFS which is an inter-frame space (IFS) in the PCF
  • DIFS inter-frame space
  • IFS represents the interval between frames and may be used to set the priority for the STA to access the medium.
  • IFS may be specifically defined as follows.
  • 9 is a conceptual diagram illustrating an interval between frames.
  • an interval between two frames may be referred to as an IFS.
  • the STA may determine whether the channel is used during the time interval of the IFS defined in the standard using a carrier detection method.
  • the MAC layer using DCF defines a plurality of IFSs. Priority of the STA occupying the wireless medium may be determined by the IFS.
  • the interval between frames according to IFS type is as follows.
  • SIFS short inter frame symbol
  • PCF IFS PCF frame transmission
  • DIFS DIFS
  • a DCF as a method for sharing a wireless medium by a plurality of STAs in the MAC layer.
  • a DCF when a plurality of STAs attempt to perform initial access (initial access) to the AP at the same time, a lot of collisions occurred between the plurality of STAs.
  • QoS quality of service
  • 802.11e improves channel access performance of the existing DCF and HCF by defining a new coordination function, a hybrid coordination function (HCF).
  • HCF defines two channel access methods similar to those defined in the existing 802.11 MAC, HCCA controlled channel access (HCCA) and enhanced distributed channel access (EDCA).
  • traffic categories which are transmission priorities, may be defined and priorities for accessing the channel may be determined based on the traffic categories. That is, by defining CW and IFS according to the category of traffic data transmitted from the STA, the channel access priority according to the type of traffic data can be determined.
  • the data may be assigned to a low priority class.
  • the traffic data may be allocated to a high priority class to perform channel access.
  • EDCA When using EDCA, higher priority traffic data may have more opportunities to be transmitted relative to lower priority traffic data. Also, on average, an STA with high priority traffic may have less latency than an STA with low priority traffic before sending a packet.
  • transmission priority can be implemented by assigning shorter CWs to higher priority traffic than lower priority traffic, and also assigning shorter arbitration inter-frame space than IFS, the frame interval defined in DCF.
  • EDCA may also allow the STA to access the channel without contention during a period called TXOP (Transmit Opportunity). The STA may transmit as many packets as possible during the determined TXOP period without exceeding the maximum period of the TXOP. If one frame is too long to transmit all during one TXOP, it can be truncated into smaller frames. The use of TXOP can reduce the situation in which STAs with a low data rate, which is a problem of the existing MAC, excessively occupy the channel.
  • FIG. 10 is a conceptual diagram illustrating a method of obtaining a TXOP of an STA.
  • an STA participating in QoS transmission may obtain a TXOP capable of transmitting traffic for a certain period of time using two channel access methods such as EDCA and HCCA.
  • TXOP acquisition is made possible by either succeeding in EDCA competition or receiving QoS CF-Poll frames from the access point.
  • the TXOP obtained after successful in the EDCA competition is called EDCA TXOP
  • the TXOP obtained by receiving QoS CF-Poll frame from the AP is called Polled TXOP.
  • a certain time may be given or a transmission time may be forcibly limited by any one STA to transmit a frame using the concept of TXOP.
  • the transmission start time and the maximum transmission time of the TXOP may be determined by the AP.
  • the EDCA TXOP may be notified to the STA by the beacon frame, and the Polled TXOP by the QoS CF-Poll frame.
  • EDCA and HCCA which are channel access methods defined in HCF, will be described in detail.
  • EDCA can perform channel access by defining eight user priorities for traffic data. For transmission of QoS data frames based on priority, EDCA defines four access categories (AC_BK, AC_BE, AC_VI, AC_VO). In EDCA, traffic data arriving at the MAC layer with different user priorities can be mapped based on AC as shown in Table 2 below.
  • Table 2 is an exemplary table showing the mapping between user priority and AC.
  • EDCA can use AIFS [AC], CWmin [AC], CWmax [AC] instead of DIFS, CWmin, CWmax which are used by DCF in the backoff procedure for transmitting frames belonging to AC.
  • Parameters used for the backoff procedure for each AC may be delivered to each STA from the AP in a beacon frame. The smaller the value of AIFS [AC] and CWmin [AC], the higher the priority. Therefore, the shorter the channel access delay, the more bandwidth can be used in a given traffic environment.
  • the backoff procedure of EDCA which generates a new backoff counter, is similar to the backoff procedure of the existing DCF. Can be performed based on other EDCA parameters.
  • EDCA parameters have become an important tool used to differentiate channel access for various user priority traffic. Appropriate setting of EDCA parameter values, including AC-specific parameters, can optimize network performance while increasing the transmission effect of prioritized traffic. Therefore, the AP must perform overall management and coordination functions for the EDCA parameters to ensure fair access to all STAs participating in the network.
  • 11 is a conceptual diagram illustrating an EDCA channel reference model.
  • four AC-specific transmission queues defined in an 802.11e MAC may serve as individual EDCA contention entities for wireless medium access within one STA.
  • An AC can maintain its own backoff counter with its AIFS value. If there is more than one AC that has been backed off at the same time, the collisions between the ACs can be handled by a virtual collision handler. The frame at the AC with the highest priority is sent first, and the other ACs update the backoff counter again by increasing the contention window value.
  • the start of TXOP occurs when the channel is accessed according to EDCA rules. If more than two frames are stacked in an AC, the EDCA MAC can attempt to transmit multiple frames if an EDCA TXOP is obtained. If the STA has already transmitted one frame and can receive the transmission of the next frame and the ACK for the same frame within the remaining TXOP time, the STA attempts to transmit the frame after the SIFS time interval.
  • the TXOP limit value may be passed from the AP to the STA. If the size of the data frame to be transmitted exceeds the TXOP limit, the STA splits the frame into several smaller frames to transmit within the range not exceeding the TXOP limit.
  • FIG. 12 is a conceptual diagram illustrating a backoff procedure of the EDCA.
  • each traffic data transmitted from the STA has a priority and may perform a backoff procedure based on a competing EDCA scheme.
  • Table 2 which is given to each traffic, the priority may be divided into, for example, eight.
  • each STA has different output queues according to priorities, and each output queue operates according to the rules of the EDCA.
  • Each output queue may transmit traffic data using different Arbitration Interframe Space (AIFS) according to each priority instead of the previously used DCF Interframe Space (DIFS).
  • AIFS Arbitration Interframe Space
  • DIFS DCF Interframe Space
  • the STA needs to transmit traffic having different priorities at the same time, the collision is prevented in the terminal by transmitting the traffic having the highest priority.
  • Backoff occurs in the following situations.
  • a transmission collision occurs and is used when retransmission is required.
  • the UE sets an arbitrary backoff time to the backoff timer using Equation 2 below.
  • Random (i) is a function that generates a random integer between 0 and CW [i] using a uniform distribution.
  • CW [i] is the contention window between the minimum contention window CWmin [i] and the maximum contention window CWmax [i], where i represents the traffic priority.
  • CWnew [i] is calculated using Equation 3 below using the previous window CWold [i].
  • PF is calculated according to the procedure defined in the IEEE 802.11e standard.
  • CWmin [i], AIFS [i], and PF values may be transmitted from the AP using a QoS parameter set element that is a management frame.
  • the HCCA protocol uses a hyper coordinator (HC) located at the AP for central management of wireless media access. Since the HC centrally manages the wireless media, it can reduce competition for accessing the wireless media between STAs and can maintain the data frame exchange with a short transmission delay time (SIFS), thereby increasing network efficiency.
  • HC hyper coordinator
  • the HC controls transmission delay and scheduling by defining QoS characteristics as parameters for specific traffic required from an application service to support QoS.
  • the HC Before transmitting the parameterized QoS traffic, the HC first establishes a virtual connection called a traffic stream.
  • the traffic stream may correspond to both an uplink from the STA to the AP, a downlink from the AP to the STA, or a direct link from the STA to the STA.
  • traffic characteristics such as frame size, average transmission rate, and QoS request parameters such as delay time are exchanged through a mutual negotiation process.
  • the TXOP restriction value which is a service provision time allowed to the STA, is included in the QoS control field. That is, the HC performs a function of controlling allocation of medium access time using TXOP.
  • the TXOP limit is determined by TSPEC.
  • the TSPEC is requested by the station, and the AP determines whether to allow or reject the TSPEC's request according to network conditions.
  • the HC provides contracted QoS by allocating the radio band required for the established traffic stream between the AP and the STA.
  • the HCCA has total control over the media, and in the competition cycle, if necessary, the control of the media can be obtained by transmitting QoS CF-Poll frames after the PIFS delay.
  • 13 is a conceptual diagram illustrating Polled TXOP timing.
  • a polled STA that owns TXOP receives a QoS CF Poll frame and transmits several frames with the authority for channel access for a time corresponding to the TXOP limit value specified in the QoS CF-Poll frame.
  • other STAs although not applicable to them, set their NAV by adding TXOP time and a predetermined time after receiving the QoS CF-Poll frame, and do not compete for channel access during this time.
  • the HC needs to schedule the proper transmission of the QoS CF-Poll frame to satisfy the contracted QoS requirements. Since wireless media vary in channel conditions over time or location, creating an efficient scheduling algorithm is an important factor in supporting QoS. Good scheduling algorithms can improve the performance of wireless networks by allowing more traffic streams without violating QoS contracts.
  • an embodiment of the present invention discloses a method of performing initial access by distributing terminals when multiple STAs perform initial access to the AP at the same time.
  • the UE performs the backoff procedure based on the same backoff parameter regardless of the AC of the UE.
  • the backoff procedure is performed based on the same backoff parameter regardless of whether the data transmitted and received between the STA and the AP is delay-sensitive or delay-sensitive.
  • a backoff is performed based on information on AC of traffic data transmitted and received between the STA and the AP and / or information on whether the STA transmits and receives delay sensitive traffic data.
  • Disclosed is a method in which a plurality of STAs perform a backoff procedure based on different backoff parameters by adjusting an off parameter.
  • Table 3 shows a backoff parameter used by the STA according to an embodiment of the present invention to perform initial access to the AP.
  • the values of the backoff parameters disclosed in Table 3 may vary as exemplary values to indicate setting different backoff parameters according to AC.
  • CWmin may indicate the minimum size of CW corresponding to a slot time unit.
  • CWmax may indicate the maximum size of CW corresponding to a slot time unit.
  • CWmin and CWmax may be the minimum value and the maximum value of CW that the STA uses at the time of backoff to access the AP. As the values corresponding to CWmin and CWmax are smaller, the STA may have a priority for accessing the medium when performing the backoff procedure.
  • the AIFSN may include information on the number of slots to be deferred after the SIFS interval before the STA performs the backoff procedure or the transmission. If the STA determines that the medium is idle during the period corresponding to AIFS based on carrier sensing, the STA may perform a backoff procedure or transmit a frame. As the time corresponding to AIFS is smaller, the STA may have priority in accessing the wireless medium.
  • the TXOP limit may include information on a section in which the STA can transmit data after obtaining the TXOP. That is, the TXOP limit may include information on the time that the STA can use when the STA accesses the wireless medium. If the TXOP is '0', the STA is currently assigned to the TXOP as a single MSDU (MAC service data unit), MMPDU (MAC management protocol data unit), A-MSDU (aggregated-MSDU), and A-MPDU (aggregated- MPDU), or a frame corresponding to PS-Poll, requested ACK information, a frame related to RTS and / or CTS, beamforming, a frame for link adaptation, a frame including a block ACK, etc. may be transmitted. Can be.
  • MSDU MAC service data unit
  • MMPDU MAC management protocol data unit
  • A-MSDU aggregated-MSDU
  • A-MPDU aggregated- MPDU
  • the CWmin, CWmax, AIFSN, and TXOP limits disclosed in Table 3 are examples of types of backoff parameters that vary according to the classification of data transmitted and received between the STA and the AP. That is, according to an embodiment of the present invention, the backoff parameter changed according to AC or priority of data may be at least one parameter of CWmin, CWmax, AIFSN, and TXOP limit. It may also be another set of parameters including CWmin, CWmax, AIFSN, TXOP limit.
  • the backoff parameter changed according to AC or priority of data is referred to as FILS backoff parameter. For convenience of description, the description is mainly based on the FILS backoff parameter that varies with AC.
  • the information on the FILS backoff parameter defined according to AC may be information that is previously set and known by the AP and the STA, or may be variable parameter information transmitted from the AP to the STA.
  • the AP may provide information about the FILS backoff parameter in an initial access frame (e.g., beacon frame, FILS beacon frame, probe response frame and / or unsolicited probe response frame, etc.). And transmit to the STA.
  • the STA may determine a FILS backoff parameter to use according to AC and / or priority corresponding to the STA, and may perform a backoff procedure based on the STA.
  • priority or AC access class or access categories
  • CWmin, CWmax, and AIFSN values can be changed.
  • the STA may preferentially access the AP in the order of AC, Voice, Video, Best Effort, and Background.
  • FIG. 14 is a conceptual diagram illustrating a method by which an AP transmits a FILS backoff parameter according to an embodiment of the present invention.
  • the AP may include a FILS backoff parameter in a frame for initial access and transmit it to the STA (step S1400).
  • the AP may use information measured by the AP and / or information generated by the STA and transmitted to the AP to determine the FILS backoff parameter.
  • the AP In order to determine the FILS backoff parameter, the AP periodically measures the BSS average access delay value, and the FILS backoff parameter reflecting the BSS load and congestion conditions of the access procedure is transmitted to the STA. Can transmit
  • the FILS backoff parameter may be included in a frame used to perform an initial connection such as a FILS beacon frame, a measurement pilot frame, a normal beacon frame, a probe response frame, or an unsolvent probe response frame.
  • the AP may receive information for determining the FILS backoff parameter from the STA and change the FILS backoff parameter periodically or aperiodically by reflecting a corresponding value to transmit the FILS backoff parameter to the STA.
  • the FILS backoff parameter may be transmitted including a FILS beacon frame, a measurement pilot frame, a normal beacon frame, a probe response frame, an unsolvent probe response frame, and the like.
  • Information for determining the FILS backoff parameter is 1) the AC or UP information of the terminal, 2) backoff retry count, 3) packet retransmittion count, 4) the most recent backoff interval (etc.) This can be.
  • the above-described information for determining the FILS backoff parameter may also be used as information for controlling access to the medium of the terminal. That is, on the basis of the above information for determining the FILS backoff parameter, the AP may restrict access of all terminals when it determines that the BSS load reaches the maximum capacity. In another embodiment, separate access restriction may be performed according to AC and / or UP.
  • the STA may perform a backoff procedure based on the FILS backoff parameter information transmitted by the AP (step S1420).
  • the STA may perform a backoff procedure based on the received FILS backoff parameter information.
  • 15 is a conceptual diagram illustrating a backoff procedure according to an embodiment of the present invention.
  • FIG. 15 discloses a method of performing another backoff procedure to AC in the case of Table 3 described above.
  • AIFSN can be selected as 2.
  • CW may be determined in a range where CWmin is (aCWmin + 1) / 4-1 and CWmax is (aCWmin + 1) / 2-1.
  • AIFSN can be selected as 3.
  • CW may be determined in a range where CWmin is (aCWmin + 1) / 2-1 and CWmax is aCWmin.
  • AIFSN may be chosen to be 6.
  • CW may be determined in a range where CWmin is aCWmin and CWmax is aCWmax.
  • AIFSN may be selected as 9.
  • CW may be determined in a range where CWmin is aCWmin and CWmax is aCWmin.
  • the STA can quickly access the medium according to the AC of the traffic data transmitted by the STA.
  • a legacy STA is distinguished from a FILS terminal (802.11ai-based STA) that performs FILS, and a terminal that performs access in a specific time interval is allocated to distribute access of the STA ( distribution). Also, among the FILS terminals performing FILS, the terminal to perform the initial access may be indicated by the aforementioned access distribution procedure.
  • the FILS access distribution indication parameter can be newly defined to perform this indication.
  • the AP may send a FILS Access Distribution Indication parameter to the STA to indicate whether the STA performs a backoff procedure based on access distribution, that is, a backoff procedure by the FILS backoff parameter.
  • the STA may determine whether to perform a backoff procedure based on an access distribution or an existing general backoff procedure when accessing a wireless medium based on the received FILS access distribution indication parameter.
  • the AP may transmit an initial access frame (eg, a FILS Beacon frame, a measurement pilot frame, a normal beacon frame, a probe response frame, an unsolvent probe response frame) including the FILS access distribution indication parameter to the STA.
  • an initial access frame eg, a FILS Beacon frame, a measurement pilot frame, a normal beacon frame, a probe response frame, an unsolvent probe response frame
  • Table 4 below shows a wireless medium access method of the terminal.
  • the terminal receiving the FILS access distribution indication parameter may access the AP using the backoff procedure using the FILS backoff parameter only when the FILS access distribution indication parameter is set to 1. On the contrary, when the FILS access distribution indication parameter is set to 0, no access may be performed or a backoff procedure may be performed based on an existing EDCA parameter set.
  • the FILS backoff parameter may be determined according to whether the STA is a delay sensitive STA.
  • the STA may be a delay sensitive STA, which is a delay sensitive STA, and a delay tolerant STA, which is an STA that is not delay sensitive. ) Can be separated.
  • Whether the STA is sensitive to delay in transmitting and receiving data may be determined based on, for example, whether the STA performs active scanning or passive scanning. That is, the delay sensitive STA may perform initial access through active scanning, and the delay tolerant STA may perform initial access through passive scanning.
  • the STA may be controlled to access a medium with a lower priority than the delay sensitive STA in performing a back-off procedure.
  • the scanning method is an example of a criterion for distinguishing a delay sensitive STA and a delay tolerant STA, and may classify the STA into a delay sensitive STA and a delay tolerant STA based on another method.
  • An embodiment of the present invention discloses a method for distributing access by a method of resetting a FILS backoff parameter assuming a delay tolerant STA in case of a STA performing passive scanning.
  • the STA may know information on whether to perform active scanning or passive scanning based on the scanType information included in the MLME-SCAN.request primitive. For example, when the scan type included in the MLME-SCAN.request primitive is ACTIVE, the STA may perform an existing backoff procedure to access the medium. In contrast, when the scan type included in the MLME-SCAN.request primitive is PASSIVE, the STA may access the medium by performing a backoff procedure based on the FILS backoff parameter transmitted from the AP.
  • the FILS backoff parameter set in the STA that performs the passive scanning may be expressed by the term passive scanning FILS backoff parameter.
  • Table 5 below shows an example of a passive scanning FILS backoff parameter according to an embodiment of the present invention.
  • the FILS backoff parameter for performing passive scanning may not include a CWmin value unlike the conventional FILS backoff parameter.
  • the STA sets the CWmin value of CW at the first backoff attempt to, for example, aCWmin value.
  • the STA performing passive scanning may directly set the CW value to the CWmax value when attempting the backoff. That is, by extending the CW of the STA performing passive scanning, the initial access time points of the terminals performing the initial access may be distributed.
  • CWmax value in Table 5 is an example of a method for lowering the priority for the STA to access the medium by increasing the CW length of the STA performing passive scanning.
  • a CWmax value other than aCWmin may be used.
  • 16 is a conceptual diagram illustrating a method of transmitting a passivating scanning FILS backoff parameter according to an embodiment of the present invention.
  • the AP may include a passive scanning FILS backoff parameter in a frame performing initial access and transmit the same to the STA (step S1600).
  • the AP may transmit a passive scanning FILS backoff parameter to a STA in a frame in which the STA may perform passive scanning, such as a beacon frame, a FILS beacon frame, and an unsolvated probe response frame.
  • the unsolvated probe response frame indicates a probe response frame that the AP transmits to the STA in a broadcast method.
  • the STA that receives the frame including the passive scanning FILS backoff parameter may perform a backoff procedure based on the passive scanning FILS backoff parameter. (Step S1620).
  • the STA performing passive scanning may select CW as CWmax.
  • channel access of the STA performing passive scanning may be slower than that of the STA performing active scanning.
  • 17 is a conceptual diagram illustrating a backoff procedure of an STA that performs passess scanning according to an embodiment of the present invention.
  • the first STA 1710 is an STA that performs active scanning
  • the second STA 1720 is an STA that performs passive scanning.
  • the first STA 1710 may select CW between a value of CWim and a value of CWmax.
  • the second STA 1720 may select CW as the CWmax value.
  • the first STA since the size of the CW of the first STA 1710 is smaller than the size of the CW of the second STA 1720, the first STA may preferentially access the medium rather than the second STA.
  • a backoff parameter having a value larger than the existing backoff parameter may be allocated to the STA performing passive scanning.
  • Table 6 below shows a method of assigning passive scanning FILS backoff parameters according to an embodiment of the present invention.
  • a value larger than the basic backoff parameters CWmin, CWmax, DIFS, and TXOP limit may be used as the passive scanning FILS backoff parameter.
  • the STA performing active scanning may preferentially access the medium because the initial IFS is smaller than the STA performing passive scanning. Since the size of the CW is also increased, the STA performing active scanning may be set to have a high priority.
  • a backoff parameter corresponding to N times the existing backoff parameter may be allocated.
  • the N value may be delivered to the terminal through a FILS Discovery Frame or a beacon frame.
  • An STA performing passive scanning may perform a backoff procedure for initial access by calculating a value corresponding to N times the default backoff parameter based on the transmitted N value.
  • Table 7 below shows a passive scanning FILS backoff parameter representing N times the backoff parameter.
  • FIG. 18 is a conceptual diagram illustrating a backoff procedure based on a FILS backoff parameter according to an embodiment of the present invention.
  • an STA performing passive scanning transmits a combining request frame after receiving a beacon frame.
  • the AP may transmit information on 'N' based on the beacon frame (step S1800).
  • the STA may receive information about 'N' for N times the backoff parameter included in the beacon frame.
  • the STA may multiply the values corresponding to CWmin, CWmax, and AIFSN of the existing backoff parameters by N to calculate the passive scanning FILS backoff parameters used in the backoff procedure for transmitting the association request frame to the AP.
  • a passive scanning FILS backoff parameter corresponding to N times may be used according to data transmitted by the STA (step S1820).
  • the FILS backoff parameter may be determined to have different values according to AC, which is a classification of traffic data transmitted by the UE.
  • AC which is a classification of traffic data transmitted by the UE.
  • the value calculated by multiplying the corresponding FILS backoff parameter by N may be used as the passiv scanning FILS backoff parameter.
  • Table 8 below shows the pass-scan scanning FILS backoff parameter calculated by multiplying the FILS backoff parameter by N.
  • the value of the passive scanning FILS backoff parameter disclosed in the present invention may be dynamically changed according to the load for performing the measured access at the AP.
  • the value of the dynamically changing passive scanning FILS backoff parameter may be dynamically changed by being included in the FILS beacon frame, the beacon frame, and the measurement pilot frame transmitted by the AP.
  • the initial access procedure based on the passive scanning FILS backoff parameter disclosed in the present invention can be applied to all management frames transmitted by the STA to perform the initial access.
  • the initial access procedure based on the passive scanning FILS backoff parameter disclosed in the present invention can be applied to all management frames transmitted by the STA to perform the initial access.
  • the distribution since the distribution has already been applied to the subsequent transmission frame, it may be applied only to the first management frame transmitted by the STA to perform initial access after receiving the beacon frame.
  • FIG. 19 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • the wireless device 1900 may be an AP or a non-AP station (STA) that may implement the above-described embodiment.
  • STA non-AP station
  • the wireless device 1900 includes a processor 1920, a memory 1940, and a radio frequency unit 1960.
  • the RF unit 1960 may be connected to the processor 1920 to transmit / receive a radio signal.
  • the processor 1920 implements the functions, processes, and / or methods proposed in the present invention.
  • the processor 1920 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
  • the processor 1920 may implement to control the backoff procedure of the STA by transmitting a FILS backoff parameter to the STA.
  • the STA receives a fast initial link setup (FILS) backoff parameter from an access point (AP), and the STA receives the FILS backoff parameter and access category information of data to be transmitted by the STA. It may be implemented to perform the backoff procedure using the final FILS backoff parameter determined based on.
  • FILS fast initial link setup
  • the processor 1920 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a data processing device, and / or a converter for translating baseband signals and wireless signals.
  • the memory 1940 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
  • the RF unit 1960 may include one or more antennas for transmitting and / or receiving a wireless signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memory 1940 and executed by the processor 1920.
  • the memory 1940 may be inside or outside the processor 1920 and may be connected to the processor 1920 by various well-known means.

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Abstract

L'invention concerne un procédé et un appareil permettant une distribution d'accès initial sur un LAN sans fil. Le procédé permettant un accès initial par une station (STA) comporte les étapes suivantes : la STA reçoit un paramètre d'attente de paramétrage de liaison initiale rapide (FILS) provenant d'un point d'accès (AP) ; la STA met en oeuvre une procédure d'attente au moyen du paramètre d'attente de FILS final déterminé sur la base du paramètre d'attente de FILS, et d'une catégorie d'accès des données devant être transmises par la STA. L'accès initial de la STA peut ainsi être distribué.
PCT/KR2013/005374 2012-06-18 2013-06-18 Procédé et appareil permettant une distribution d'accès initial sur un lan sans fil WO2013191448A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016122138A1 (fr) * 2015-01-30 2016-08-04 한국전자통신연구원 Dispositif de sélection de compteur d'attente pour l'accès aléatoire à un canal, et procédé associé
WO2017007180A1 (fr) * 2015-07-09 2017-01-12 엘지전자 주식회사 Accès aléatoire de station fonctionnant dans un système de réseau local sans fil
WO2017039141A1 (fr) * 2015-09-02 2017-03-09 엘지전자 주식회사 Procédé permettant d'ajuster la taille d'une fenêtre de contention sur la base de la classe de priorité dans un système d'accès sans fil prenant en charge une bande sans licence, et dispositif prenant en charge ledit procédé
WO2017069534A1 (fr) * 2015-10-20 2017-04-27 엘지전자 주식회사 Procédé de transmission de trame de déclenchement dans un système lan sans fil, et terminal l'utilisant

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY165673A (en) * 2012-03-02 2018-04-18 Interdigital Patent Holdings Inc Methods and system for performing handover in a wireless communication system
US9516634B2 (en) * 2013-05-03 2016-12-06 Qualcomm Incorporated Systems and methods for downlink frequency domain multiplexing transmissions
PL3320743T3 (pl) * 2015-07-06 2020-12-14 Telefonaktiebolaget Lm Ericsson (Publ) Węzeł nadawczy i sposób w tym węźle do wykonywania transmisji danych do co najmniej jednego węzła odbiorczego na kanale radiowym w bezprzewodowej sieci telekomunikacyjnej
GB2540450B (en) 2015-07-08 2018-03-28 Canon Kk Improved contention mechanism for access to random resource units in an 802.11 channel
GB2543583B (en) * 2015-10-23 2018-05-16 Canon Kk Improved contention mechanism for access to random resource units in an 802.11 channel
US10477568B2 (en) * 2015-12-02 2019-11-12 Qualcomm Incorporated Methods and apparatus for multiple user uplink
GB2561677B (en) * 2016-02-29 2020-03-18 Canon Kk Improved contention mechanism for access to random resource units in an 802.11 Channel
GB2548155B (en) * 2016-03-11 2020-06-17 Canon Kk Improved access to random resource units by a plurality of BSSs
US10091778B2 (en) * 2016-04-14 2018-10-02 Qualcomm Incorporated Random access resource unit allocation for a multiple BSSID network
US11083021B2 (en) * 2016-04-14 2021-08-03 Qualcomm Incorporated Random access resource unit allocation for a multiple BSSID network
CN109417713B (zh) * 2016-10-28 2022-03-04 慧与发展有限责任合伙企业 用于接入点竞争窗口改变的系统、方法和机器可读介质
EP3534664B1 (fr) 2016-10-31 2023-08-16 Sony Group Corporation Appareil de communication et procédé de communication
GB2571005B (en) * 2017-01-10 2020-02-12 Canon Kk Improved access management to multi-user uplink random resource units by a plurality of BSSs
GB2580842B (en) * 2018-03-01 2021-02-10 Canon Kk Improved access management to multi-user uplink random resource units by a plurality of BSSs
US11452114B2 (en) 2018-09-03 2022-09-20 Sony Corporation Wireless communication control device, wireless communication control method, wireless communication device, and wireless communication method
CN110234172B (zh) * 2019-05-08 2022-05-31 腾讯科技（深圳）有限公司 一种数据传输的方法、接入类别创建的方法及装置
CN111328148B (zh) * 2020-03-11 2023-04-07 展讯通信（上海）有限公司 数据传输方法及装置
US11395336B2 (en) * 2020-03-13 2022-07-19 Huawei Technologies Co., Ltd. Method and apparatus for priority transmission of WLAN frames

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050152373A1 (en) * 2004-01-08 2005-07-14 Interdigital Technology Corporation Packet scheduling in a wireless local area network
WO2012030852A1 (fr) * 2010-08-31 2012-03-08 Qualcomm Incorporated Règles de multiplexage de données de catégories d'accès différentes dans systèmes sans fil mimo à utilisateurs multiples
US20120071192A1 (en) * 2010-09-21 2012-03-22 Qinghua Li Device, system, and method of adjusting channel utilization for wireless transmission
KR20120037176A (ko) * 2010-10-11 2012-04-19 삼성전기주식회사 무선 네트워크에서의 채널 억세스 방법

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8526464B2 (en) * 2010-01-26 2013-09-03 Kapsch Trafficcom Ag Adaptive contention window in discontinuous wireless communication channels
SG11201405541WA (en) * 2012-03-06 2014-10-30 Interdigital Patent Holdings Supporting a large number of devices in wireless communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050152373A1 (en) * 2004-01-08 2005-07-14 Interdigital Technology Corporation Packet scheduling in a wireless local area network
WO2012030852A1 (fr) * 2010-08-31 2012-03-08 Qualcomm Incorporated Règles de multiplexage de données de catégories d'accès différentes dans systèmes sans fil mimo à utilisateurs multiples
US20120071192A1 (en) * 2010-09-21 2012-03-22 Qinghua Li Device, system, and method of adjusting channel utilization for wireless transmission
KR20120037176A (ko) * 2010-10-11 2012-04-19 삼성전기주식회사 무선 네트워크에서의 채널 억세스 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AZHAGURAMYAA, V.R. ET AL.: "An enhanced scheduling algorithm for QoS optimization in 802.11 e based networks", GLOBAL JOURNAL OF COMPUTER SCIENCE AND TECHNOLOGY, vol. 12, no. 5, 31 March 2012 (2012-03-31), pages 23 - 27, Retrieved from the Internet <URL:http://computerresearch.org/stpr/index.php/gjcst/article/download/1034/916> *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016122138A1 (fr) * 2015-01-30 2016-08-04 한국전자통신연구원 Dispositif de sélection de compteur d'attente pour l'accès aléatoire à un canal, et procédé associé
WO2017007180A1 (fr) * 2015-07-09 2017-01-12 엘지전자 주식회사 Accès aléatoire de station fonctionnant dans un système de réseau local sans fil
KR20180018472A (ko) * 2015-07-09 2018-02-21 엘지전자 주식회사 무선랜 시스템에서 동작하는 스테이션의 랜덤 액세스
US10728846B2 (en) 2015-07-09 2020-07-28 Lg Electronics Inc. Random access of station operating in wireless LAN system
KR102594901B1 (ko) 2015-07-09 2023-10-27 엘지전자 주식회사 무선랜 시스템에서 동작하는 스테이션의 랜덤 액세스
WO2017039141A1 (fr) * 2015-09-02 2017-03-09 엘지전자 주식회사 Procédé permettant d'ajuster la taille d'une fenêtre de contention sur la base de la classe de priorité dans un système d'accès sans fil prenant en charge une bande sans licence, et dispositif prenant en charge ledit procédé
US10455605B2 (en) 2015-09-02 2019-10-22 Lg Electronics Inc. Method for adjusting contention window size considering priority class in wireless access system supporting unlicensed band, and apparatus for supporting same
US11147088B2 (en) 2015-09-02 2021-10-12 Lg Electronics Inc. Method for adjusting contention window size considering priority class in wireless access system supporting unlicensed band, and apparatus for supporting same
WO2017069534A1 (fr) * 2015-10-20 2017-04-27 엘지전자 주식회사 Procédé de transmission de trame de déclenchement dans un système lan sans fil, et terminal l'utilisant
US10575314B2 (en) 2015-10-20 2020-02-25 Lg Electronics Inc. Method for transmitting trigger frame in wireless LAN system and terminal using same

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US20150139209A1 (en) 2015-05-21
KR20150023307A (ko) 2015-03-05
US9521694B2 (en) 2016-12-13
KR101585823B1 (ko) 2016-01-14

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